Related Questions

Those magnetic materials are best suited for making armature and transformer cores which have ________permeability and _________hysteresis loss.
A High, high
B Low, high
C High, low
D Low, low
The effective size of sand particles used in slow sand filters is
A 0.25 to 0.35 mm
B 0.35 to 0.60 mm
C 0.60 to 1.00 mm
D 1.00 to 1.80 mm
Laminated cores, in electrical machines, are used to reduce
A Copper loss
B Eddy current loss
C Hysteresis loss
D All of the above
Cores are used to
A Form internal cavities in the casting
B Improve mould surface
C Form a part of a green sand mould
D All of these
The ratio of sand to gravel in a mixture is 7 : 8 while that between gravel and cement is 6 : 7. What is the ratio of sand to cement in the mixture?
A 49 : 48
B 7 : 7
C 8 : 6\
D 3 : 4
For a loose sand sample and a dense sand sample consolidated to the same effective stress
A ultimate strength is same and also peak strength is same
B ultimate strength is different but peak strength is same
C ultimate strength is same but peak strength of dense sand is greater than that of loose sand
D ultimate strength is same but peak
If the sand in-situ is in its densest state, then the relative density of sand is
A zero
B 1
C between 0 and 1
D greater than 1
Uniform ramming of sand in green sand moulding process leads to
A Reduced chance of gas porosity
B Greater dimensional stability of the casting
C Uniform flow of molten metal into the mould cavity
D Less sand expansion type of casting defect
Insufficient washing of sand grains in a rapid sand filter causes
A Air binding
B Shrinkage of filtering media
C Mud balls
D Expansion of filtering media
The property of sand due to which the sand grains stick together is called
A Collapsibility
B Permeability
C Cohesiveness
D Adhesiveness

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